The department shall administer the provisions of this chapter. The department may promulgate regulations to carry out the provisions of this chapter. In addition to general regulations, the department may promulgate further regulations based on the individual attributes of each designated scenic river area if regulations do not defeat, conflict with, or minimize the provisions of the general regulations for each class of scenic river. No scenic river may be managed in a manner that would result in the river corridor falling into a less restrictive class. Nothing in this chapter or its implementation may restrict reasonable utilization of the rivers in the program for fishing from the banks of the rivers or river segments.